Amadivayisi Kagesi Womuntu Siqu I-Adhesive
Ukusetshenziswa kwezinamathelisa kanye nama-sealant embonini ye-elekthronikhi manje sekusakazekile futhi azifaki isandla ngqo ekwakhiweni kwemikhiqizo ye-elekthronikhi kodwa nasekusebenzeni kwayo isikhathi eside nokuphila isikhathi eside. Ukusetshenziswa okukhulu kwezinamatheliso embonini ye-elekthronikhi kufaka phakathi ukuhlangana kwezingxenye ze-surface-mount (ama-SMCs), ukubopha izintambo kanye ne-potting noma i-encapsulating components. Isakhiwo esiyisisekelo semboni ye-elekthronikhi yibhodi lezintambo eziphrintiwe noma, njengoba livame ukubizwa kanjalo, ibhodi lesifunda eliphrintiwe (PCB). I-PCB isebenzisa izinto zokunamathisela ekuhlanganiseni izingxenye ze-surface-mount, i-wire tacking, i-conformal coatings kanye ne-encapsulating (potting) izingxenye.
Izigaba ezintathu ezihlukene zokucubungula kufanele zicatshangelwe lapho kukhethwa ingcina yezinhlelo zokusebenza zika-elekthronikhi (noma ezinye): isigaba esingalapheki noma se-liquid-resin, isigaba sokuphulukisa (sesikhashana) kanye nesigaba esiphulukisiwe noma esiqinile.
Ukusebenza kwe-adhesive eselashiwe ekugcineni kubaluleke kakhulu ngoba kuthinta ukwethembeka.
Indlela yokusebenzisa i-adhesive nayo ibaluleke kakhulu, ikakhulukazi ngenxa yesidingo sokuqinisekisa ukuthi inani elifanele lisetshenziswa endaweni efanele.
Izindlela eziyinhloko zokusebenzisa izinto ezinamathelayo ezinhlelweni zikagesi ukuphrinta isikrini (ukucindezela into enamathelayo ngamaphethini esikrinini), ukudluliswa kwamaphini (kusetshenziswa ama-multi-pin grids adlulisa amaphethini okudonsa okunamathelayo ebhodini) kanye nokufakwa kwesirinji (lapho amashothi anamathelayo enziwa khona. ilethwe ngesirinji elawulwa ukucindezela). Ukufakwa kwesirinji cishe kuyindlela ethandwa kakhulu, imvamisa ngendlela yamasirinji alawulwa nge-electro-pneumatically ukuze kukhiqizwe okusesilinganisweni kwezinhlobo eziningi ezahlukene ze-PCB.
Manje sekuzobhekwa izinhlobo ezahlukene zokunamathisela.
Ngokwemvelo yazo, izinto ezinamathelayo eziningi, kokubili eziphilayo nezingaphili, azihambisani ngogesi. Lokhu kusebenza ezinhlotsheni eziyinhloko ezisetshenziswa ezinhlelweni zikagesi ezifana nama-epoxies, ama-acrylics, ama-cyanoacrylates, ama-silicone, ama-urethane acrylates nama-cyanoacrylates. Kodwa-ke, ezinhlelweni eziningi, kufaka phakathi amasekhethi ahlanganisiwe kanye namadivayisi akhuphuka phezulu, ama-adhesive conductive kagesi ayadingeka.
Indlela evamile yokuguqula ama-adhesive angewona ama-conductive ezintweni ezisebenza ngogesi ukufaka isigcwalisi esifanelekile kusisekelo; ngokuvamile lesi sakamuva siyi-epoxy resin.
Izigcwalisi ezijwayelekile ezisetshenziselwa ukunikeza i-conductivity kagesi isiliva, i-nickel ne-carbon. Isiliva yiyona esetshenziswa kakhulu. Ama-adhesive conductive ngokwawo asesimweni esiwuketshezi noma sangaphambili (amafilimu anamathelayo aqinisiwe ayasikwa ngaphambi kokuba ahlanganiswe nesimo esidingekayo).
Kunezinhlobo ezimbili zokunamathisela okuqhutshwa ngogesi - isotropic ne-anisotropic. Izinamatheliso ze-Anisotropic zihamba kuzo zonke izinhlangothi kodwa ingcina ye-isotropic iqhuba ngokuma mpo (i-axis) isiqondiso kuphela futhi ngaleyo ndlela i-uni-directional.
Izinamatheliso ze-isotropic ziboleka ekuxhumekeni komugqa omuhle. Kufanele kuqashelwe ukuthi, njengoba i-adhesive conductive iwusizo, ayikwazi ukumane 'ifakwe' njengezinye izindlela zokuthengisa. Azikho kahle kumathini (noma ama-tincontaining alloys) noma ne-aluminium, noma lapho kunezikhala ezinkulu noma lapho okungenzeka zichayeke khona ezimeni ezimanzi (ezimanzi, ezimanzi) lapho kuseviswa.
Izinamathiselo ezisebenza ngogesi
Ngokwemvelo yazo, izinto ezinamathelayo eziningi, kokubili eziphilayo nezingaphili, azihambisani ngogesi. Lokhu kusebenza ezinhlotsheni eziyinhloko ezisetshenziswa ezinhlelweni zikagesi ezifana nama-epoxies, ama-acrylics, ama-cyanoacrylates, ama-silicone, ama-urethane acrylates nama-cyanoacrylates. Kodwa-ke, ezinhlelweni eziningi, kufaka phakathi amasekhethi ahlanganisiwe kanye namadivayisi akhuphuka phezulu, ama-adhesive conductive kagesi ayadingeka.
Indlela evamile yokuguqula ama-adhesive angewona ama-conductive ezintweni ezisebenza ngogesi ukufaka isigcwalisi esifanelekile kusisekelo; ngokuvamile lesi sakamuva siyi-epoxy resin.
Izigcwalisi ezijwayelekile ezisetshenziselwa ukunikeza i-conductivity kagesi isiliva, i-nickel ne-carbon. Isiliva yiyona esetshenziswa kakhulu.
Ama-adhesive conductive ngokwawo asesimweni esiwuketshezi noma sangaphambili (amafilimu anamathelayo aqinisiwe ayasikwa ngaphambi kokuba ahlanganiswe nesimo esidingekayo).
Kunezinhlobo ezimbili zokunamathisela okuqhutshwa ngogesi - isotropic ne-anisotropic. Izinamatheliso ze-Anisotropic zihamba kuzo zonke izinhlangothi kodwa ingcina ye-isotropic iqhuba ngokuma mpo (i-axis) isiqondiso kuphela futhi ngaleyo ndlela i-uni-directional.
Izinamatheliso ze-isotropic ziboleka ekuxhumekeni komugqa omuhle. Kufanele kuqashelwe ukuthi, njengoba i-adhesive conductive iwusizo, ayikwazi ukumane 'ifakwe' njengezinye izindlela zokuthengisa. Azikho kahle kumathini (noma ama-tincontaining alloys) noma ne-aluminium, noma lapho kunezikhala ezinkulu noma lapho okungenzeka zichayeke khona ezimeni ezimanzi (ezimanzi, ezimanzi) lapho kuseviswa.
Ama-adhesives conductive thermally
I-Miniaturization ye-electronic circuitry ingase ibangele izinkinga zokwakheka kokushisa, okungabangela ukwehluleka ngaphambi kwesikhathi kwezingxenye ze-elekthronikhi uma izinga lokushisa eliphezulu lokusebenza lidlula. I-adhesive conductive thermally conductive ingasetshenziswa ukunikeza indlela yokusingatha ukushisa, i-fastening transistors, ama-diode noma amanye amadivaysi kagesi kumasinki okushisa afanelekile ukuze kuqinisekiswe ukuthi ukushisa okunjalo akwenzeki.
I-Metallic (i-electrically conductive) noma i-non-metallic (insulating) powders ihlanganiswe ekwakhiweni kwe-adhesive ukwenza izinamathiselo eziphezulu ze-viscosity (unamathisele), ezisebenza kakhulu ezishisayo (uma ziqhathaniswa nezinamathelisi ezingagcwalisiwe). Amasistimu we-thermal conductive ajwayelekile kakhulu akhiwe nge-epoxy, i-silicone nama-acrylics.
Ama-adhesives e-ultraviolet
Okunamathelisa ukukhanya, okokugqoka kanye nama-encapsulants asetshenziswa embonini yokukhiqiza izinto zikagesi ngokukhula kwemvamisa ngoba ahlangabezana nezidingo zezinto zokwakha nokucubungula ngaphakathi kwale mboni. Lezo zici zifaka izimfuno zemvelo (izincibilikisi ezilimaza imvelo nezithasiselo azidingeki), ukuthuthukiswa kwesivuno sokukhiqiza kanye nezindleko zomkhiqizo. Izinamatheliso ezilapha ukukhanya kulula ukuzisebenzisa, futhi zelapheka ngokushesha ngaphandle kwesidingo sokuphulukiswa kwezinga lokushisa eliphakeme.
Izinamatheliso ngokuvamile ziwukwakheka okusekelwe ku-acrylic futhi ziqukethe ama-photo-initiators okuthi, uma ecushwe emisebeni ye-ultraviolet, akhe ama-radicals mahhala ukuze aqalise inqubo yokwenza i-polymer (yokwelapha). Ukukhanya kwe-Ultraviolet kumele kukwazi ukungena ku-resin engalashwa - i-drawback ye-adhesives lightcuring. Amadiphozithi e-resin anombala omnyama, ongafinyeleleki noma awugqinsi kakhulu kunzima ukuwelapha.
